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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b06f4db315e9d39c357813f333541971b9bccb761622f280a243ed8cc33d637' 
  AND token = '9Y3SZe7OaLUQDZ1ysKbXaDTNp/+7Pnh2d6/aZTKRW2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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