Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c51eee32ff15269817d39a91c94c1408e7e321f128dd567902d9f6a069fb6c' 
  AND token = 'AN8Phsp3H4buWl+rl+JOCW42pnRLYOp8HqszMAJFo1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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