SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d73498866f2cc6f279cec5cb025fdb12df9bbd495c1258d02dc134ad9b9c61d' 
  AND token = 'KBprP+dOwOh7DxchGjr0AH5/qbJzrGbf2a6w3U1CHbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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