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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a602402289575339577e0131d78b05a37faa7976137a90e9ef440b9088dc22db' 
  AND token = 'qbHpeToJTEjcWkIU6Fc+aWRUOjM8BdPJ9Y+noztEK1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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