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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df5468f318b9e17d90b983c9bedfcdd10f2e9a9c206c22335da55c814053b7e' 
  AND token = 'iRYRnDWohXHYo9pxnZktYJGRr+itkho8/ZLL352HElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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