Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a53e1729e3300bbb1ee9d912a776759967df2d4458db4dd118756e53cbc184' 
  AND token = 'krL/CzjHCXA84F6P7QiXZ+hlT7dlxKSWcHUHJiywT1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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