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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b8caadc4c3add660a71020d159099e151c232f10dfc29cf6a758d9664d0079' 
  AND token = '/roGQ446d0TrqpdQ64fkbZBQj5DzFLG/GxYB1ARoyRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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