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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc8c1b261a7c7e614b389856c7b7fff2b9cfbf7930339b5b2041fd8260219db' 
  AND token = 'TSh7oegnJb8rV/naFDczcTw1OndGU5i0BL35IWcd8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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