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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b94f5fe5848fcdd35984986c7cec7ccda0061f2cb908094ca24387e87cc479' 
  AND token = 'a9xy2JNQZyeqiipC52xjVeil6A9vqY5zxw7JPP3IoIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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