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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2d5144e81c92a866ad4a648d9692a3106f659c2e01c4f0f601ba7d9c5a149f' 
  AND token = 'S/2HbkGUTYaMaoyZXjQOdVPI92Wqxv580wPnC0W/DbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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