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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bad75e1e05b1e9c5391f2bf0c61eb725b542811893c36f82638566fed7a8e8f' 
  AND token = '5t7x5G824uhkL7RcuwfsxVHaR9Q0YcHu1NrFDfbEEbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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