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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60116c1601d8083668bf0ce04e984a641404b16a28201ddee278257c1996260e' 
  AND token = 'Q4RGQE0CgnaB3xem3jig+gY9SdMZBqG6fL/JDEfcFjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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