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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497edbe4853c2f06883dc5adfe0762d2891f10b2a8e355a4874406288bf43b07' 
  AND token = 'sSl4fFssHcLnnweT5A4ViAKTstQUw3TfonEme2i9riw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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