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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983a87d06177ef5f7db2654aaaf1becc318f0e8e7c11e3d53dfe50f5b41949ca' 
  AND token = '1Bxn0nYGwA+ZlzSXo9IIT9pOuVY/HYoUiwiROQaZe7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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