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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7309c43c0c4a6e4dbfef20ec387e794f51483abd69aec77df469e047c154db' 
  AND token = 'NZg8WcwNGtK8ABU6GTVgG+yuplKBKrhi2NfnQt7UyIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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