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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67f3e2dd2305b7dd64b7a329d9e3f9d03d6479627e83bfab7437d6c611813ff' 
  AND token = 'PrLRpsGO6C6kHpH8lAOvrJTWU5k9h2T43zdZJ7QNVSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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