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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd773668ac01b8ec0e7975d3c8c5cb00227d399db1fd0a53e53701ebebaef7b6c' 
  AND token = 'gq8Jw9F7lBXBUB0Ifbs6o2vvONlo5XUuejkCuyq3hYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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