SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2504303803c79cc813c9dfbce74097347a9119148026be5f6b5fa1a5ab4669d' 
  AND token = 'D97EipxFL1NVf8W4Ih7FGY+qgsHOeS59Vox4I0tAmTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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