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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da03fdb6dccf491a499f945397a9e892897ffbcb9a00904e144b27e4ee308fa' 
  AND token = 'JdIm93r0eU+9iBBDkqmrUM8GI5+OoQ74gmmInmsOVgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}