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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af44ce20601919ffab568efba130882d8234864ca347983c1fdb7a15505f10fc' 
  AND token = 'mtWMu3gKdffJ4RMqS612blAg6BAKg3DJMRsOjxpCs7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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