Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f7f9a51b11c0f0d9a81b505e0fd2750e194a56b77dbcf0fff4807b5b4ce49b' 
  AND token = 'F/vseQJ6lslLdGmFQEOB9Pa8LpBY86n6+PscsGwkApY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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