SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d7b7f8a0c8c5043666cdf1eb36f2849f8885e5e1791f1723894d8a8a22dd3e' 
  AND token = 'ZoEXemwFRvX21ywFA6u2hcOLCnqxLcBplqz2JEYqW0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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