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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4628ce852fff500f1a11182c2dcba7f59fee812fbb18b62f91fa511dc0c3b54' 
  AND token = 'tmJ3lFwVNY0YiUm4KEahMbV4AqMJosncjnCe9rtNHGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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