SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4044df120896d554ad32b4857a81bf3ef4011484db7b4171a368163d5344b237' 
  AND token = 'BwvnhsVscUulPmR+Frr00XtKRzXBsI9FIutUOQHwhDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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