SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89519d5bd9d30eb073a0596a0d1ce0ce5385d04bf19da428c22b7f278ecf6019' 
  AND token = 'SuZJ4QeJSzDBEHBSBlIOMWg/lnJb9+3wsdzfGzZaqio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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