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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc475a7a82d5822ec15e31a2b189a4c0e55f36b3a93f6a3a14c1486f3d30a3ae' 
  AND token = 'wEob03PNe+cKrvvEu/EyILXyRnFEYRCUe9grbK0XdGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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