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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dd4f4b074b0700664c65aef4774a348d3ea38e1cf1f37b91a6ba78d09b1ba0' 
  AND token = 'gTfkZDTzAi2LfOj0EM61Xw6kACGxRF8S3FtPbgLWqdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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