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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adae44b3df5cb924001a1c39b8abbb1636d80deb922bbf517db92aeb2ffac91' 
  AND token = '0fkk4h2jcWbmA++2f79FNO/oezEHIdNiGfR12VS++4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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