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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474c4f5a5c5c83019673d121131d81d181a3395988bd1c4a020c0806d30356fb' 
  AND token = '02/RfAeIw8G2F/O85OOFxn7yF648542XNPmnlZ5BwbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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