SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a26a6d7dd3ab29527cf7cbbc31f40f0af95d46fbb85378a5f55a7634897165' 
  AND token = 'wrRTpczCP15VeOm9l71FMzsJIxXav0QzyFBWMDZhlho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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