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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749f8c1604466ce605f82667d79960d9821562c1effe015a95f62288ba90f6e1' 
  AND token = 'hntB3jnjSwNXdPZZ/VXQ9VghhFNTr82sEby71Uv13uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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