SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d569b06f141a512c3f12b6340c47fef97fc44d5d42a1d036d3a6da2c0b0b2b' 
  AND token = 'QPWW85UkJelDOHS81LrFo/WmmRWx8MV9+QDwZjq24Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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