SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32169786c8f2764cb3cefb76b4d129275e9ebcc0ea81165289281c145c59d7f5' 
  AND token = '6cd4rSDJreTrrt0F8+BaG27OBU8oYca1saPaFs+esyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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