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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b792670ca051d9ae0f45dcf9e76c6579f8d2710af753c5a27785468a5b234dff' 
  AND token = 'lojblMLCkfj/1BOrGwJSrwXZx8VY3a69q20w21SfOak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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