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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f09f12b06e5969e360962c6fbcd53b47cec897e64b13c9c7d61cc1ec797786' 
  AND token = '7Svbs2JJ+/R0BZH6FmJv2TO6xCLiP9i7iRIQNlrUX6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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