SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180c708b82ece67254e3a6dfe15b5745d9091864b6be3f1d66d991dff39dc5eb' 
  AND token = '/kFOx3EEab/MhbRzCL+I9cguAZwKUFFX68FOVWKgYSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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