SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b397e214b647882c60de28f0fe223d8f92772b9f6dda1b627a67c0313c2944' 
  AND token = 'iNxbnZuUJbHpSIqa7eL3qaqDPh+dJ7wVKosysV5v8BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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