SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b44190333170da8549f512267e56a3bd5c28269efc8a8cb527ed1107ebe6ee3' 
  AND token = 'pPtKJBXhuGY9+xOGFUjAi8CyCTriw7/co7p1FgdjGHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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