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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd1458da6e5d7320580948827c694b4ee82092d472556343ee9cc50ebf8a39f' 
  AND token = 'DWVQLj2KOyPI4pPSk8U873lzMuIxAqPaMub5YRQy5qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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