SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0776ce9e8d7f1966560c76649f160ad562128c744e9d4b45af03a896e2c92c65' 
  AND token = 'HyEl9s0tfhgRU3v5oDPhRQbxy4uBU9KVtzVrZW7Y8jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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