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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23902bfe98cb8592634b3c03134b926dcaf7c039acb617aa23122db91b552d4' 
  AND token = '+4nIit3TXZawZbN8Oc6Zk7YiCewdPHekpDVyenoBUr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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