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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad8c76f81f08ae5d03c4014555c86ba9f2e8c3833a31f60bc6e1daeef456b5a' 
  AND token = '5BOrvHUmjKSPDVrF65oUjtQZBAjyNpq4GJEvR6GogWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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