SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd13b0f21b8337fbde8912de49c7f9e1e9b23051e0dbe5bc41d452c16f4d104' 
  AND token = 'KCI63k0Gg9jBCqn+qJDcf7qvMkz/tY1Y7VDetZsTFrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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