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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3d88f8078d515255c7e80dc6eeb63ca7fa18230b67944cbd479e3b8d0d53ce' 
  AND token = 'Vl14iA4T7NIGOngQUe1WxnzZyB3M2GAgGZZK5GoLwuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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