SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98127af9dc8d06e71b72dc7b0c870b4f6fd9ac8523f84febc1ae3c036d867404' 
  AND token = '+G1dK/5wGp75M2aThUqmmIw2BgzXK/PCAPqqRodgqqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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