Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6503ff8aecb219d6149a722b0696cef6b2dc46483ad191ccb18743bc647b30' 
  AND token = 'okD7fPHixIq96I+nowe9bsL+91VpJG+1u2DD8EFaxRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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