SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70fedd18f87fee2d2f607365e72930ba24447acf7c5625696b06d248b271b2d' 
  AND token = 'tRwEBnVgFRoPCBb1/8vyGEuMSYCjF0XpzXyxGKezlEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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