SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48062f83a917cb5cd3c34169697a2e5307c5a602e6ba40153074773dfffe5099' 
  AND token = 'GFtiIVxshAfs+DoS9lwHm+VgPGqe1ADbchz2rIELtKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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