SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77c9e4b1d5245f69c525df1ae518d0f949141f5d4331fab7a8bd276b7330f7e' 
  AND token = '38aXmz5KDvg6vKcaXn91hjFvcdG2/h6HxkT+DnY76q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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