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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671bfe931a45c510fbc29ebcc84a562579608f88dcb485ca06666c9f8e298fe4' 
  AND token = 'eZLyKZxIWANjuG2fw0XE/3avbqFij6k885kcW/QouMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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