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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a35ad8239dd5b4a9a89ce2a7ab622b8c477bf4b940ddd6c81c275eeb405039e' 
  AND token = 'eldv2XnwHn5mwSAa1BZ7AyTTrFx48d1QqD9pK1Zd1Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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