SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab116890e14ba759b3d8db1abb598c619e656cbd7ff2761f5bdf45231f1e56fd' 
  AND token = 'xkuWdt7DvSLGeIu+4BwQKo10UrXz55JW+Wze7I9/YPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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