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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f48479fdf037f9028e01d04d8acdb99fe760639a33c34923d6cfbe8393005f' 
  AND token = 'OzeCgT7Wvh7Kc+979UxF/ZVrQQTi9aWJbpRVBhz7Zr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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