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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15adff92dbea4b95efdfa4d630214a8a64d52853b945d5c15939757e69b04df5' 
  AND token = 'e+0c9Q/Y7YiHX6r1Clvk6/WrhhufMtsG2dzDQecSJoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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