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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c75c60a35e2a7b9b213edb102161fb7ba8b55af52ea0dbd3654a864efab3ee' 
  AND token = 'CkEKMMO9WBF6Udoo9LjRwv0SRmZuFWeND9lIUT2wbfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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