SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27b94a92410d4b1468cfebe3173014b7105c90e93eaf95e33d97562c2e34fa9' 
  AND token = 'Icu+8PRgViDK65o4rEl+sUq4S8jY8V/pGHo+2EZyZVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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