SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460b4bb377481e52492b763113db7740beb1230ccc9fc93f27f495fd07832cb9' 
  AND token = 'ZN6H4qzb9RigCwjHPPJEI1UQi/kBTM6ejJZja+jPs3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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