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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec149ae8d994c92d265d540c83e56b64a8b25a4a38eee49d7612eea4e0194a50' 
  AND token = 'gCdKbnvzlfGam2z5ShC0Ue6Shxp7IR1CTl0J+X4S9UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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