SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43acd71c290f057423f6f93634656b79837ecd941a61ff4ebacc3a9b1b9780bc' 
  AND token = 'BVDnXxWEdxXTgol9ttvkdqjRakuKlLkh/P2YpiM2X98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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