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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf117b91a541485b0827d1b8871d41a7f2a788a420fdf8ce3bd7209e0e0c19c' 
  AND token = 'WPezERjiPSPZgMjLYe2/JrKJ+wsGi3HVvtUaXZ017Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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