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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2355552f1d9e91a08525751390232adde150a03630bb87188b2e39e8e6d2dc6c' 
  AND token = 'SQnZOdaVDXJhPnIhelNeZgzpeJgzgO1uHyJD3cPmp7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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